bepin/BepInEx/ConsoleUtil/ConsoleWindow.cs

// --------------------------------------------------
// UnityInjector - ConsoleWindow.cs
// Copyright (c) Usagirei 2015 - 2015
// --------------------------------------------------

using System;
using System.IO;
using System.Runtime.InteropServices;
using System.Text;

namespace UnityInjector.ConsoleUtil
{
    internal class ConsoleWindow
    {
        private static bool _attached;
        private static IntPtr _cOut;
        private static IntPtr _oOut;

        public static void Attach()
        {
            if (_attached)
                return;
            if (_oOut == IntPtr.Zero)
                _oOut = GetStdHandle(-11);

            // Store Current Window
            IntPtr currWnd = GetForegroundWindow();

            //Check for existing console before allocating
            if (GetConsoleWindow() == IntPtr.Zero)
                if (!AllocConsole())
                    throw new Exception("AllocConsole() failed");

            // Restore Foreground
            SetForegroundWindow(currWnd);

            _cOut = CreateFile("CONOUT$", 0x80000000 | 0x40000000, 2, IntPtr.Zero, 3, 0, IntPtr.Zero);
            BepInEx.ConsoleUtil.Kon.conOut = _cOut;

            if (!SetStdHandle(-11, _cOut))
                throw new Exception("SetStdHandle() failed");
            Init();
            _attached = true;
        }

        public static string Title
        {
            set
            {
                if (_attached)
                {
                    if (value == null)
                    {
                        throw new ArgumentNullException(nameof(value));
                    }
                    if (value.Length > 24500)
                    {
                        throw new InvalidOperationException("Console title too long");
                    }

                    if (!SetConsoleTitle(value))
                    {
                        throw new InvalidOperationException("Console title invalid");
                    }
                }
            }
        }

        public static void Detach()
        {
            if (!_attached)
                return;
            if (!CloseHandle(_cOut))
                throw new Exception("CloseHandle() failed");
            _cOut = IntPtr.Zero;
            if (!FreeConsole())
                throw new Exception("FreeConsole() failed");
            if (!SetStdHandle(-11, _oOut))
                throw new Exception("SetStdHandle() failed");
            Init();
            _attached = false;
            
        }

        [DllImport("user32.dll")]
        private static extern IntPtr GetForegroundWindow();

        [DllImport("user32.dll")]
        [return: MarshalAs(UnmanagedType.Bool)]
        static extern bool SetForegroundWindow(IntPtr hWnd);

        [DllImport("kernel32.dll", SetLastError = true)]
        private static extern bool AllocConsole();

        [DllImport("kernel32.dll")]
        private static extern IntPtr GetConsoleWindow();

        [DllImport("kernel32.dll", ExactSpelling = true, SetLastError = true)]
        private static extern bool CloseHandle(IntPtr handle);

        [DllImport("kernel32.dll", CharSet = CharSet.Auto, SetLastError = true)]
        private static extern IntPtr CreateFile(
            string fileName,
            uint desiredAccess,
            int shareMode,
            IntPtr securityAttributes,
            int creationDisposition,
            int flagsAndAttributes,
            IntPtr templateFile);

        [DllImport("kernel32.dll", SetLastError = false)]
        private static extern bool FreeConsole();

        [DllImport("kernel32.dll", SetLastError = true)]
        private static extern IntPtr GetStdHandle(int nStdHandle);

        private static void Init()
        {
            var stdOut = Console.OpenStandardOutput();
            var stdWriter = new StreamWriter(stdOut, Encoding.Default)
            {
                AutoFlush = true
            };
            Console.SetOut(stdWriter);
            Console.SetError(stdWriter);
        }

        [DllImport("kernel32.dll", SetLastError = true)]
        private static extern bool SetStdHandle(int nStdHandle, IntPtr hConsoleOutput);
        
        [DllImport("kernel32.dll", BestFitMapping = true, CharSet = CharSet.Auto, SetLastError = true)]
        private static extern bool SetConsoleTitle(string title);
    }
}